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Related Concept Videos

Fineness Modulus01:19

Fineness Modulus

The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...

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Study on Microstructure and Texture of Fe-3%Si Ultra-Thin Ribbons Prepared by Planar Flow Casting.

Jiangjie Xu1, Ning Zhang1, Yang Tu1

  • 1Metallurgical Technology Institute, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China.

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|October 16, 2024
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Summary

Optimizing ultra-thin silicon steel production involves temper rolling Fe-3%Si ribbons at 7% reduction followed by 950°C annealing. This process enhances {001} grain growth, crucial for superior magnetic properties in non-oriented electrical steel.

Keywords:
crystal plasticity finite element (CPFE)deformation stored energyplanar flow casting (PFC)temper rollingultra-thin non-oriented silicon steel{001} texture

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid State Physics

Background:

  • Ultra-thin non-oriented silicon steel is vital for electrical applications.
  • The planar flow casting (PFC) technique offers a method for producing Fe-3%Si ribbons.
  • Controlling microstructure and texture is key to optimizing magnetic properties.

Purpose of the Study:

  • To investigate the feasibility of preparing ultra-thin non-oriented silicon steel using PFC ribbons.
  • To analyze the evolution of microstructure and texture during temper rolling and annealing.
  • To determine optimal processing parameters for enhanced {001} grain growth.

Main Methods:

  • Planar flow casting (PFC) for Fe-3%Si ribbon preparation.
  • Temper rolling with varying reduction rates (7% and 15%).
  • Annealing treatments at elevated temperatures.
  • Microstructural and textural analysis using experimental measurements.
  • Crystal plasticity finite element (CPFE) simulations for stored energy analysis.

Main Results:

  • PFC ribbons initially show a columnar structure with over 30% {001}-oriented grains.
  • Annealing alone preserved the {001} texture.
  • Temper rolling at 7% reduction followed by annealing promoted selective {001} grain growth, peaking at 950°C.
  • Temper rolling at 15% reduction inhibited the growth advantage of {001} grains.
  • CPFE simulations indicated lower stored energy in {001} grains at 7% reduction, favoring growth via the SIBM mechanism.

Conclusions:

  • A 7% reduction temper rolling followed by annealing at 950°C in a hydrogen atmosphere is optimal for synergistic microstructure and texture control.
  • This process enhances the proportion of {001} grains, beneficial for magnetic performance.
  • The stored energy difference, influenced by rolling reduction, dictates grain growth behavior during annealing.